Type-writing and computing machine.



G. J. BARlgETT. TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED SBPT.8,1911. 1,066,455' Patented July 1, 1913.

11 SHEETS-SHEET 1.

W WMZ] A TTORNE Y.

G. J. BARRETT. TYPE WRITING AND CDMPUTING MACHINE.

APPLICATION FILED SEPT.8,1911.

1,066,455, Patented July 1, 1913.

l1 SHEETS-SHEET 2.

WTNESSES.' NVENTO.

G. J. BARRETT. TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED SEPT.8,1911. 1,066,455. Patented July 1, 1913.

1l SHEETS-SHEET 3.

1N 'EA/TOR.

WI TNESSES ATTORNEY.

Patented July 1, 1913.

APPLICATION FILED SEPT. 8

NVENTR M TNEY WJTNESSES:

G. J. BARRETT. TYPE WRITING AND COMPUTING MACHINE.

.APPLICATION FILED SEPT.B,1911. 1,066,455. Patented July 1, 1913.

@www

/NVEN TOI.

I'V/YYVESSES:

@www

G. J. BARRETT. TYPE WRITING AND COMPUTING MACHINE.

APPLIUATION FILED SEPT.8,1911', l 1,066,455. Patented July 1, 1913.

11 SHETS-SHEET G.

www

www

WJTNESSS.-

G. J.. BARRETT.

TYPE WRIT ING AND COMPUTING MACHINE.

APPLICATION FILED SEPT.8,1911. 1,066,455, Patented July I1,

1l SHEETS-SHEET 7.

ATTORNEY.

G. J. BARRETT. TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED SEPT. B, 1911. v

Patented July 1, 1913.

l1 SHEBTSrSHEET 8.

M MMT' BY A TTRNE Y.

WTNESSES:

G. J. BARRETT. TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED BEPT.8,1911. 1,066,455.

Patented Jul'y I, 1913.

1'1 SHEETS-SHEET 9.

I `./VVNTOR.

A TTORNEY.

WITNESSES:

INV,"A

G. J. BARRETT. TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED SEPT.8,1911. 1,066,455, Patented July 1, 1913.

LVJTNESSES:

ATTORNEY.

G. J. BARRETT. TYPE WRITING AND COMPUTING MACHINE. APPLIGATIDN FILED SEPT.8,1911.

1,066,455. Patented July I, 1913.v

11 SHEETS*SHEET 11.

MAI-M5555. A Inn/ENTER.

@MMM

1-h5 ATTIIRNEY UNITED STATESv PATENT OFFICE.

GLENN J. BARR-ETT, 0F GRAND RAIIDS, MICHIGAN, ASSIGNOR TO THE SMITH. PREMIER TYPEWRITER COMPANY, OF SYRACUSE, NEW YORK, A CORPORATION 0F NEW `Yon-K.

TYPE-WRITING AND COMPUTING MACHINE.

Speccation of Letters Patent.

Patented July 1, 1913.

Application led September 8, 1911. Serial No. 648,297.

To all whom t may concern Be it known that I, GLENN J. BARRnrr, citizen ot the United States, and resident of Grand Rapids, in the county of Kent and State of Michigan, have invented certain new and useful Improvements 1n Type.

written on the typewriter are automaticallyregistered; but many of the improvements;

are applicable to computing machines in which there is no \printing apparatus, and' to so-called listing machines 1n which the numbers are printed but in which no' provision is made for writing words generally. y My invention comprises numerous improvements in the computing mechanism itself, in the. connections between `,the computing mechanism and the typewriting mechanism, in means for actuating a plurality of registers from a single set of keys, in means for effecting either addition or subtraction as desired, in the denomination selecting mechanism, and in other features and parts of the machine, all as will be understood from the detailed description. l

' To the above ends, my invention consists in certain features oi. construction and combinations and arrangements of part'slr'all of i which will be fully set forth herein and-particularly pointedV out in the claims.

One embodiment of my invention is illustrated in the accompanying drawings, in which- Figure 1 is a right-hand side elevation of the' machine with a side plate of the computing machine removed, and with some parts broken away or in section, and somev parts omitted. Fig. 2 is a top plan View of the computing mechanism with the typewriter removed, and with a few vparts in section. Figs. 8, 4 and 5 are enlarged diagrammatic side views illustrating portions of the transfer mechanism, the parts being;

shown in different positions in the different views. Fig. 6 is a top plan' view of the registers with certain parts l omittedandv parts broken away.y Figsv?, 8 anda?) 4are'- side elevations in "vertical section o-parts of the registering mechanism and some asscciated parts. In Figs. 7 and 9 the section is on the line www of Fig. 10, and in Fig;`

8 the section is on the line y-g/ of Fig. 10. Fig. 10 is an enlarged top plan View, partly in section, of part ot' one of the registers and showing some of the associated mechanism.

Figs. 11 and 12eme 'fragmentary side elevations in vertical section and showing a register Wheel and a part of the transfer mechanism and certain locking and releasing de- Vices. Fig. 13 is a` fragmentary rear eleva- 'tion of certain selecting mechanism which is controlled by the typewriter carriage. Figs. 111 and l5 are side elevations of certain connecting devices, the parts being in normal position in Fig. 14 and in positions corresponding to the bottom of a key stroke in Fig. 15. Fig. 16 is a view of one of the registerspin vertical section on'the line z-sof Fig. 6. Fig. 17 is a view in vertical fore and aft section of the principal parts ot the denomination selecting mechanism in the positions they occupy during the down stroke of a key. Fig. 18 is a view in fore and aft vertical section of some of the key mechanism and the differential mechanism, parts being shown in the positions they occupy when. the 9 key is fully depressed. Fig. 19 is a top plan view of the feelers and associated parts constituting part ot the denomination selecting mechanism. Fig. 20

-is a top plan View of the 4key arrester. Figs.

21, 2Q. and 23 are elevations in fore and att vertical section and illustrating the mechanism for accurately positioning Ithe parts at the end of a -key stroke. Figs. Q4 and 25 arei'ragmentary side elevations of parts of the mechanism for coupling one or the other or both of two registers with the diiterential mechanism. Fig. 26 is a side vview of one ot the register wheels. Fig. 27 is a view similar to Figs. 24C and 25, but showing more of the mechanism and also showing means for setting the machine for addition or subtraction.l In Figs. 2 4, 25 and 27the register selecting mechanism is shown in three different positions. Figs. 28, 29, 30, 31 and 32 are detail views of different parts of the register selecting mechanism, Fig. 33 is a` view similar to "part of Fig. 27 but on an enlarged'scale and showing the parts in the midst of a key stroke. Fig. 34 is a rear elevation of Fig. 33. '.Fig. 35 is a top plan Sziew of some of the partsshown in Fig. 27.

Fig. 36 is a.' right-.hand end view of part of the register frame. Fig. 37 is ra vlewin fore and aft vertical section on the l1ne w-w of Fig. .6 and .showing pagt ofthe register frame and oneof the add and s ubtract keys and its connections. Fig. 38 1s a fragmentary top plan vie-w of part of the mechanism shown in Fig. 21. Fig. 39 is a detail of onev of the numeral keys vof theA typewriter and its connections. Fig. 40 is a view in horizontal section of part of the computer key connections. Fig. 41 is a side elevation of the computer keys and some of their connections with a casing plate removed. Figf42 is a top plan view of one ofI the registers, on an enlarged scale and show-y ing some of the parts omitted in Fig. 6, and omitting some of 'the parts shown in said Fig. 6.

In producing a combined typewriting and computing machine I prefer to use a type writer of standard make and I have here shown my invention in connection with al Smith Premier No. 10 typewriter. The main frame of this machine comprises a lower part 1 consisting of side plates which are suitably connected at their bases and which support a top plate 2. Standards 3 rising from said top plate support a grooved lcarriage rail 4 which by means of anti-friction 'balls or rollers 5 supports/a paper carriage '6 having grooved rails 7 that coperate with the Arollers 5. The carriage 6 has mounted 'thereon a platen 8 against the front face of which are adapted to strike types 1() mounted on type bars 11 which type bars are mounted on two segments 12. Said type bars are operated through connections com prising links 13, subdevers 14, links 15 and key levers 16, by means of printing keys 17, the printing keys 17 having stems 18 which are connected to the bell crank key levers 16. 'Ihe machine is also provided with a space key'20. The levers 14 are mounted on a segment 21 and are controlled by returning springs 22. Each of the type bars at its free end is adapted to strike against a light meshes with a rack bar-25 on the carriage.

lever or universal bar 23 which operates an escapement that allows the carriage 6 p to be fed step by step under the impulse of a spring drum .which is not shown but which is connected with a 'gear wheel` 24 that For the purpose ofwriting columns of figures the carriage 6 is controlled by tabulator mechanism which comprises a column stop bar 26 having mounted thereon column stops 27y (Figs. 1 and 13).. The bar 26 is formed with a series of notches as shown in Fig. 13 to provide for adjustment of the column stops to any desired letter s ace-- position and said stop bar is supported rom the carriage by arms 30, Fig. 1. A series of key operated -denominational stops 31 are -vided with restoring springs 48.

controlled by tabulator keys 32. When one of these keys `is depressed the correspondcarriage 6 :from its escapement mechanism and allows said carriage to run free until arrested by the tabulator stops. l

I have notv deemed it necessary to illustrate or describe the typewriting mechanismin detail as the machine referred to is in eX- LThe computer frame comprises a sort of rectangle that is situated beneath lthe typewriter and on which the typewriter rests. Said frame has two side bars 34 which 'at their rear are connected by a cross bar 35 and which are also connected by other frame pieces, some, at least, of which will be hereinafter referred to. Holes 36 (Fig. 2) in the top of the bars 34, serve to secure in position short bosses or posts 37, Fig. 1, which take the place of the rubber feet on which typewriters usually stand and said posts serve to connect the computer frame with the typewriter frame. The connection is made more complete by' certain screws which pass upward through holes 38 in the computer frame and are` threaded into the typewriter frame. The two"- frames can be disconnectedby'removing these two screws. As shown in Fig. 1, the computer frame projects somewhat in ,front of the typewriter frame where it is covered by a casing plate 40 having openings therein through which the register wheels are visible as seen in Fig. 2.

The computing machine here shown is key operated, alt-houghmany of the features of the invention are applicable to machines that are otherwise operated; and in vthe present instance a special set of numeral keys is yprovided which operates the computer and the typewriter, the ordinary typewriter numeral keys being lleft free to print numbers that are not intended to be registered. As shown in Fig. 2, t-he right-hand side bar 34 has an off-set 41 extending to f the right of the typewriter frame and thence extending vertically to form a sort of plate 42 having a flange 43 (Figs. 40 and 41) projecting therefrom. To said flange there is secured by screws 44 a strip of sheet metal 45 bent into theshape shown in Fig. 41 to constitute a sort of casing and guide for the stems 46 of the 4special computer keys 47 and said keyvstems inside the casing 45 are pro- The. key stems 46 are made of such length as to bring the keys 47 upto somewhere near the level I ofthe printing keys 17 of thetypewrir. 139

each of the key stems 46 is pivoted at its lower end at 52 to a crank arm 53 projecting from a rock shaft 54 which extends hori zontally through the opening 49 and across the machine. There are ten of these rock shafts arranged in two tiers as shown in* Fig. 41 and each of them is-pivoted at its lefthand end in a plate 55, Fig. 2, secured 57 and screws 58 lto the parts 41 and 42.

As shown in Fig. 40 the key stems aref simply set on bent-off crank pins on .theV arms 53 and said key stems-are preventedl from becoming displaced from said crank arms by the plate 56 and also by a second'I plate 60 arranged adjacent the left-hand: series of key stems. In the Smith Premier No. 10 typewriter the numeral keys are arranged `in two rows at theleft-hand and? right-hand sides of the keyboard and the?` capital O is used for writing the zero. At the appropriate place to coperate with these several typewriter keys, each of thel rock shafts 54 has an arm 61 projecting,` therefrom and carrying a headed crank pin 62, which ,crank pin as shown in Fig. 89: normally rests in the vlower end of a key-'g hole slot 63 formed in the lower end of a link 64 which is connected tothe bell-crank' key lever 16 of one ofthe keys 17. The@ construction is suoli that when a shaft 54` is rocked by one of the computer keys47,

it operates the corresponding numeral key- 17 of the typewriter to print the numeral;.

but when said key 17 is-operated the slot 63 slides idly on the pin 62 so that the numeral is printed without affecting the- As is indicated in Fig. 1, thel arms 53 are preferably a little 'longer thanA the arms 61 so that the keys 47 have a greater Q extent of dip than the keys 17, thus allowcomputer.

ing a sulcientvamount of additional power to operate the computer in addition lto the operation` of lthe typewritingmechanism.

1n order to stiften the rock shafts 54 I have preferred to provide bearings for said shafts /near the middles thereof. In the Mpresent instance, said bearingsl are provided in a plate'65 best 'shownin Figs. 2 and 18.

In Fig. 2 this plate is shown as bent-olf at the bot-tom to form an angle or channel bar 66-which is secured at its ends to two cross hars'67 and 68in the base ofthe machine,

saidcross bars being supported by the side plates '34. As show-nl in Fig. 18, the plate '65 is formed with a series of upwardprojecf tions 70 which in their front edges are out out in semi-circular for-m to receive the shafts/54. A second plate 71 is mounted by the side of the plate 65 and said second plate has a series of downward projections 72 formed on their rear edge 'with semi-circu lar cut-outs to receive said shafts.

position and then the plate 71 is set by the side of it and pronerly adjusted and secured. to said plate 65 by means of screws 73.

The connections from the shafts 54 to the remainder of the computing mechanism, comprise upstanding arms 74 secured to vthe several shafts 54, those from the lower tier of shafts being suitably bent as shown in n In as-` sembling the machine the plate 65 is set in Fig. 18'to clear the shafts of the upper tier. The shaft 54 connected with the zero key, however, is not provided with one of these arms 74 and has no connection with the computing mechanism. Each of the arms 74 has pivoted thereto the forward end of a horizontal link 75 and each of said links preferably has a turn-buckle 76 therein for adjusting its length, as shown in Figs. 1, 2 and 18. Each of the links 75 at its rear end is pivoted to a lover arm 77 which, in turn, is pivoted on a rock shaft 78 which at its ends i'sjournaled in bosses 80 of the side plates 34. The shaft 7 8 is a rock shaft which constitutes a sort of- ,universal bar for the computing mechanism, as it is rocked in unison with any one of the lever arms 77 when said lever arms are operated by the keys. To this end each of said arms 77 has a hub 81 which is-formed with a cut-out andl into said cut-out a pin 82 projects from the shaft 78. This construction is 4clearly shown in Fig. 2 from which it will be seen that the shaft is rocked through the parts described at each operation of one of the arms 77. The shaft 78 is pro-vided with a returning spring 83, Fig. 2, connected at one end toan arm 84 depending from said rock shaft and at the other end tothe cross bar 67. As shown in Fig. 18, the plates and 71 arepreferably extended to the' rear and suitably connected as shown at 85 to stiffenv said shaft.

Each ofthe lever arms '7 7 is made integral with a segment 86 which constitutes part of a full stroke and key arrester mechanism. Each of said segments is formed on its tor-l ward edge with a series of square teeth 87 which coperate with a pawl 88 pivoted at 90 to the cross bar 68. As here shown there is one of these pawls for each of the'seg-- ments 86 and each of said pawls is controlled `by` a restoring spring 91 which normally stands at a dead center posit-ion as shown in Fig. 18.4 The pawl isfree to turn in either .direction from Asaid dead center position.

When one ofthe-segments 'has started down, -i't iscaught by its pawl 88 and can-not return lto normal position .until it `has comisopleted its down stroke. and the pawl has snapped off of the e`nd of the segment. On

Athe upstroke of the key the pawl is turned;

to pass. The construction is such that when one of these extensions or arms 961s between the balls`92 there is not room for any other of said extensions to pass between said balls sothat another key cannot be depressed until the first one has been restored to normal position by its spring 48. Theparts are arrested in normal leather or other suitable material secured to the under sideof a cross bar98 which acts as a stop bar for the key-operatedparts. A key arrester and full-stroke mechanism similar to those above described, are shown and described and claimed in a prior appli# cation of mine.,

The differential mechanism comprises arms 100 each integral with one of the lever arms 77 and segments 86. These arms 100 .extend from the shaft 78 toward the rear.

and somewhat downward and each of them constitutes a cam that coperates with a follower roller 101. There are nine of these rollers and each of them is journaled in an arm 102, said arms being iixed on a transverse rockshaft 103, by means ot hubs 104 which are-rigidly secured to said shaft. The arms 102 are spirallyarranged as shown so that the different cam arms 100 operate them to different extents. Each of said cam arms terminatesin a hook' 105 leaving a slot which prevents overthrow of the `roller 101. The last part of the cam edge of the slot is concentric with the shaft 78 and therefore constitutes a short dwell. As shown in Fig. 1 where the parts are represented in normal position, there is alsov alittle lost motion between the arms 100 and theA rollers 101 `which gives time for certain preliminary operations as will appear hereinafter.

yThe diil'erential motion of the shaft 103 is communicated to an arm v106, Figs. 30 and 34, which arm is provided with a hub 107 that is rigidly secured to the shaft 103. Said arm 106 is formed with a branch 108 which normally rests against the shaft 78 and thus determines the normal position of said arm and of the shaft 103. This branch 108 is of such construction that it can be adjusted by bending it. At'110', ig. 30, the

position by a strip 97 'ofl arm 106 has connected thereto a restoring by two separate rack bars and means are provided for coupling the arm 106 with either one of these rack bars separately or with both of them at the same time. Said rack bars are shown in Figs. 33 and 35, the

vlefthand bar being numbered 1.12 and the4 right-hand bar 113. As best shown in Fig. 28 the left-hand bar 112 is pivoted at 114 to an arm 115, the hub 116 of which is pivoted on the shaft103 at the left of thehub 107, as shown in Fig. 34, which figure is a rear view. vThe arm 115 is formed with a branch 117 which normally rests against the shaft 78 and said arm is restored to and held in normal position by a spring 118 connected lat one end to a pin 120 projecting 4from said arm and at the other end to the Yplate or bar 68 aS shown-in Fig. 35. As shown in Fig. 29 the rack bar 113 is pivoted at 121 to an arm 122, the hub 123 ot which is pivoted on the shaft 103 at 'the right of the hub 107. Said arm 122 is formed with an arresting branch 124 and is provided with a restoring spring 1,25 attached to a pin 126and to the plate 68,'the whole construction so far described being similar to the corresponding connections .of the rack 112.

rllhe arm 106 has pivoted thereto at 127 a double link or two 'parallel links 128 which extend from said pivot toward the rear and to the free ends of which is secured a cross pin 130, which extends across the arms 115 and 122 as shown in Figs. 34 and 35.

VThe construction is such that the pin 130 can be moved up and `down by turning the links 128 about the pivot127. The arm 122 is formedl at its upper part and at its rear edge with an upper hook 131 and alower hook 132, leaving an open space 133 between said hooks. The construction is such that when the pin 130 is in its uppermost position as shown in Fig. 33 and also when said pin is in its lowermost position, said pin is coupled to the arm 122 by the hook 131 or 132 as the case may be, and the `arm 122 is thereby coupled to the arm 106 so that when the shaft 103 is rocked the rack bar 113 will be correspondingly moved endwise. TWhen the pin is in its middle position shown in Fig. 24, the arm 122 and bar 113 are not coupled to the arm 106 and are not operated when a key is depressed.

The-arm 115 is formed with a hook134 (Fig. 28),v which hook corresponds in position with the hook 132 and also extends upward to correspond with the open space 133, solthat when the pin 130 is either in its lowermost position orin its middle position the arm 115 ,will be coupled to the yhaft 103 and the .rack 112 will be operate bythe .operated by an operation of the computer keys.

The pin 130 is moved to any one of'its three positions by means-of a lever 135 which is pivoted at 136 to a stationary plate 137 which is here shown as provided with a hub 138 mounted loosely on the shaft 103.

Said plate 137 also comprises a horizontal arm 140 which, as shown in Fig. 32, is formed at its forward end with an open slot 141 which, as shown in Fig. 33, embraces the plate 68 and prevents the plate 137 from turning about or with the shaft I103. Thelever 135 has a forwardly directed arm in which is formed a slot 142, Fig. 31, into which projects the reduced end 143, Fig. 35, of the pin 130. Said pin of course moves towardthe back of themachine and returns toward the front of the machine each time the shaft 103 is oscillatcd and said pin therefore normally standsin its forward position. The forward end of the slot 142 is of a width substantially equal Ito the thickness of the parts 143 of the pin, so that, when said` pin is in its normal forward posiltion it will be moved up or down by the rocking of the lever 135. The upper edge 144, Fig. 31, of the slot 142 is struck o-n an arc which, when the pin 130 is in its upper position shown in Fig. 33, is concentric with the shaft 103; and the lower edge 145 of said 'slot is preferably struck on an. arc

which is concentric with said shaft when said lever is in its lowermost position shown in Fig. 2 5.- As shown in Fig. 32, the plate 137 is formed with two fingers 146 and 147, saidA fingers being ycurved Vconcentrically with theshaft 103 and the construction is such as to leave t-wo slots 148 and 150 in said plate 137. their forward ends just in rear of the normal forward position of the pin 130 as shown in Figs. 24, 25 and 27 so thatwhen said pin and the shaft 103 arein normal position the pin is free to' be adjusted to 4any one of its three positions; but when the shaft103 begins to rock towardthe rear-the pin either moves over the finger 146 or else into one ofthe slots 148, 150 so that the up.

and down position of said in` cannot be changed afterthe shaft has egunf' tc.. turn. The forwardends of the fingers 146 and 147 also serve as a lock to prevent "the depues-. sion of a key unless the pin 130fis positioned in one of its three'positions with sufficient accuracy to be guided by said fingers exactly into its right position.

The fingers 146 and 147 haveh The lever 135 is of bell crank form and it is normally held in its uppermost position by means of a spring 151 connected to said bell crank and to the plate 137. Said bell crank is arrested inits normal position by a stop pin 152 projecting from the plate 137. It will be perceived that the machine is normally set to operate only the righthand register but that it can be set to operate only the left-hand register by moving the lever 135 part way down and it can be set to operate both registers by moving said lever allthe way down.

I have provided both automatic means and hand operated means for controlling the lever 135. The automatic means is shown in Figs. 1, 2, 13 and 27. The depending arm of the bell-crank 135, has connected thereto alink 153 which, at its rear end, is

connected to a crank arm 154 projecting l158 which is here shown as secured to the upper end of the bar by screws 160. It will of course be understood that the bar and the plate can be integral, as' they constitute in effect a single piece. The upper end of this piece is guided by a link 161 pivo-ted thereto at 162 and also pivotedl at 163 to an ear 164 bent downward from aguide plate 165 which, in the present instance, is secured to the under side of the guide plate 33 of the leo denominational tabulator stops. Any suitable provision can be made for the adjustment of the bar 157 as to length. As here shown said bar hasv a bend near its lower endand the effective length yof the bar can be changed by modifying this\bend. As will be understood by referring to Fig. '13, the

kupper surface of the plate 158" is straight and is of a vlength corresponding to the length of travel of the typewriter carriage as said carriage passes through the adding column. At each end, at 166, the edge of said plate is'beveledl to act as a cam, which cam vis controlled by-an extension-167 of one or more of the column stops 27. The construction is such that when in the travel of the carriage thisv extension passes over the plate 158, said plate will be depressed and will be held down during the travel. of the carriage through theadding field. The extent to which the plate will be depressed, will depend upon the elevation ofthe lower edge of the extension 167 and this extension may, therefore, be so constructed as to depress the plate far enough toA bring the pin. 'eitherinto the .slot -148 or into the slot as. desired;v and if desired two or more 'column stops can be provided each having such extensions and any one of said stops 50 used with extensions 167 each adapted to sion coperates with the denomination se-v lecting devices as will hereinafter appear,

but is not long enough to reach to the plate 158. When this second stop is passing the plate 158 the right-hand register only will be connected with the differential mechanism. It will thus be seen that by suitably selecting and adjusting the column stops', adding fields can 'be located anywhere desired on the paper and the numbers written in any one of said adding fields can be caused to be registered Ion either one of the registers or on both as desired and this will be done automatically Vwithout any further attention on the part of the operator, once the machine has been set.

T he hand-operated means for controlling the bell-crank 135 and thus selecting the register to be operated, comprises a key 1'70 mounted on a key stem 171, Fig. 27, and pivoted at its lower end to the. horizontal arm of a bell-crank 172 which bell-crank isv pivoted at 173 to a fixed part of the machine. Said bell cr-ank has a depending arm to which is pivoted the forward end of a link 174, the rear end'of which is pivoted to a crank arm 175 depending from the rock shaft 155. The construction is such that the Abell-crank 135 can be depressed by depressing the key 170. The stem 171 of said key passes through a hole in the cover plate 40 and said steln has one or more. notches 176 out therein at suitable points vso that when the key isdepressed it can be held in its depressed position by hooking a notch 1764 over the plate 40. If preferred, the key stem can be provided with only one of these notches 176 so arranged as to hold the key at 4its full extent of depression inv order to connect both registers with the. differential mechanism. The key 170 can, vif desired, be

used alone for selecting the registers to be.

operated and the columny stops employed can al l be devoid of the extensions 167; or if desired one or more column stops can be bring the lever 135 to its middle position to bring the left-hand register alone into operation and the key 170 can be used whenever it is desired to add on both registers. It will be seen that by suit-ably selectingL the column stops and by suitable manipulation of the key 170 the machine can be used for a great variety of work.

The different lsettings of the lever 135, are illustrated in Figs. `24, 25 and 2.7; and

in Fig. 33 the parts are shown -in one setting in the position they occupy when a key is partly depressed. Inthis figure the pin 130 is 1n its.`upper1no`st position and the rack bar 113 is being operated, the rack bar 112 remaining in normal position. Fig. 34 also shows the pin 130 in its uppermost position.

. It will of course be understood that the number of registers can be increased and the register selecting system can be extended frame rods which extend the entire length of the two registers and are supported at their ends by vertical frame plates 182 (Figs. 36 and 6) to which the rods are secured by nuts 183 threaded on to the reduced ends of the rods, which reduced ends pass through holes (Fig. 36) in the' end plates. Each of the end plates 182 has bent off therefrom two horizontal ears 184, which ears overlie ears 185 (FigL42) projecting from the side bals 34 at the front of the machine, the ears 184 and 185 being secured together by screws 186. The bars 34 also have flat flanges 187 to which the cover plate 40 is secured by screws at 188. There are two of the rods 181, each ya fixed frame rod of about the length of one of the registers and secured'at its outer end tothe plate 182 and at its inner end to another frame plate. The rod 178 is a rock shaft which will be again referred to.

The register wheels 190 are strung along a `shaft 191 (Fig. 37) which shaft passes through holes 192 (Fig. 36), said .holes being made through the end plates 182 and also through certain other plates. The regis- 4 ter wheels 190 are separated by a series of partition plates 193 having the form shown in Fig. 36, said partition plates beinO strung along rods 177 and 180 and separated by washers 194'. In numbering the frame rods in some of the figures no distinction has been made between the rods themselves and the washers strung along them. At the inner end of each register there are two plates 195 and 196 shown in planr view in Figs. 6 and 42 and in outline in Fig. 37, and it is to the plate 195 that the inner end of the frame rod 181 is secured. The shaft 191 passes through said plate 195 but the plate y196 is'formed as shown in Fig. 37 with a vdepression in its upper-edge so as `to clear said shaft for a reason which will appear hereinafter. There is for each register an' operatin shaft 197, which, as shown in Fig. 37 1s journaled vat its inner end in the late 196 and-,Which at its outer` end-.is Journaled in. a'.v hole 198 '(Fig.-36)in the length of the register. In the machine shown there are two of these shafts arranged coaxially and each of them hasmounted near its inner end a pinion 200 and said pinions are driven by the rack bars 112 and 113. As shown in Fig. 37, each of these rack bars at its forward end is forked, having a toothed rack 201 above the pinion 200 and another toothed rack 202 beneath said pinion and so arrange-d that said pinion can be engaged by either rack by moving the 'rack bar up or down.

It will be perceived that by setting the rack bar in its upper or lower position the shaft197 can be turned one way for addition and the other way for subtraction. It

will also be perceived that either of thev rack bars can be set for one,i of these characters of arithmetical operation and the other rack bar set for the other character of operation or both rack bars can be set for the same operation as desired so that it is possible to add a number on both registers at once or to subtract it from both registers' at once or to add it on either register and subtract it from the other as desired; and it is also possible, by the register selecting system which has been described, either to add 'or to subtract a number on either register without operating the other register' at all. In order to shift the rack bars up and down each of them is formed with a third branch 203, leaving a slot 204 in which travels a roller 205 which is pivoted in the rear arm of a bell-crank 206, which bell-crank is pivoted at 207 to the plate 195. The horizontal arm of the bellcrank arm is formed with an armor branch 208 that extends upward and is bent over in inverted U-shape and -the roller is joue naled between the two branches of this arm and the branch 203 of the rack vbar also passes between the two branches of said arm and is thereby guided. The bell-crank 206 carries a key 210 at its upper end and said bell-crank is normally drawn toward the front of the machine by a spring 211 which tends to move the lower rack 202 into engagement with the pinion 200. Each of the bell-cranks 206 extends upward through a suitable slot 212 in van escutcheon 213 secured to the casing plate 40. Said slot 212 is rformed at its rear end withan off-set 214 so that when the key 210 is pushed back against the tension of the spring 211, it can be set a little to one side and retained in that position. .The registers here shown work equally well either way, but the numbers are shown arranged on the wheels in such order that the registers add when the. keys 210 are in their rear positions with the upper racks 210 in engagement with the pinions 200 and said registers subtract when the keys are in their yforward positions.

In order to position the shaft 1.97 accurately at the .end of each down stroke of a key, I employ the mechanism best shown in Figs. 21, 22, 23 and 38. Near its inner end each of the shafts 197 has mounted thereon a ten-toothed star wheel 215 and said star wheelsare adapted to be arrested and positioned by the pointed ends 216 of pawls or detente 217. There is one of these pawls for each of the two star wheels. Both pawls are-rigidly mounted on a transverse rock shaft 218 which at its ends is rjournaled in ears 220 (Fig. 36) of the end plates 182, so that bothof said pawls move into and out of engagement with the star wheels together. Said pawl's normally stand away from the star wheels as shown in Fig. 21. There is provided a spring-pressed latch lever 221, pivoted at 222 to a bracket 223, which bracket is secured, in theV aresent instance, to the cross bar 67, as shown in Fig. 2. The latch 221, as here shown, cooperates only with the left-hand one of the two detents 217 which detent has an arm 224.- projecting rearward therefrom for the purpose. In Fig. 22 some of the parts connected with'the` righthand detent 217 are broken awayY in order to show this arm' and the latch lever more clearly. Said latch lever is drawn toward the front of the machine by a spring 225 connected thereto and to'the detent 217 As shown in Figs. 22 and `38, the latch lever 221 has an ear 226 projecting to the right therefrom into position to engage a notch or hook formed onthe lower edge of the arm 224. The construction is such that `these cooperating parteI are adapted to hold the toothed detente'v 217 in inoperative posit-ions. The means for operating said detents are here shown as connected with the right-hand one thereof and said means comprises a bar 227 pivotedto the rightehand detent at 228 and extending therefrom toward the rear of the machine. A second bar 230 is pivoted at its rear end at 231 toan arm 232 projectinglfroin the shaft 78, which, it will be recalled serves a sort of universal bar for the key-operated parts of'the' machine and which at each key depression is rocked toward, the front of the machine. The arm 232 normally stands as shown in Fig. 21, at an inclination upward and toward the front of the machine and at the bottom of the key depression it stands as shown in Fig. 23, about on or a little past the dead center of the bars 227, 230. These bars have an endwise sliding connection consisting of headed screws 233 which pass through elongated slots 234 in the bar 230 and are threaded into the bar 227. At their ends said bars are formed with upstanding ears 235 and 236, which ears are connected by a spring 237. During the depression of a key the rocking of the arm 232 forces the bars 230 and 227 andthe as shown in Fig. 22 after which the bar` 230 continues to move forward against the v mounted on the rock shaft 78 and 'extending thence forward and downward.

tension of the spring237, the bar `227 being held by the latch 221. At the very last of the down stroke of the key said'latch is released bythe means now to be described. A link 240 is Apivoted at 'its forward end t0 the latch lever 221 and at its rear end said link is formed lwith an' elongated slot 241 through which loosely passesa screw242- secured to the free end ot an arm 243 rigidly normally The pin or screw 242 is normally in the forward end of the slot 241 and at the end of `the down stroke of the key as shown in Fig.

23, said pin reaches the rear end of the slot and pulls the latch lever 221 toward the rear, releasing the detents 217 and allowing v them to be thrown forward by the stretched spring wheels 215. These detents strike the `star wheels a blow and -accurately position the wheels and the shafts 197. In the first part of the up stroke of the key, the latch 221 is released from the pin 242 and in the course of such up stroke the detents 217 are drawn back to normal position.

The denomination selecting 4mechanism :tor coupling the shaft 197 with the various register wheels one at a time, can be understood in part from Figs. 8 and 17 @Each of said register wheels comprises a gear or pinion 244, here shown as having twenty teeth. In the plane'of each oil said pinions 244 the shafts 197 .have rigidly mounted thereon small gears or pinions 245 so that when one of the shafts 197 is turned all of the pinion's 245 on'said shaft turn with it.

I provide connecting pinions for bringing the register wheels selectively into gear with the driving gears 245. The pinions are mounted in movable frames which, in the present instance, are pivoted co-axially with the shaft 197. There isfor each denomination a frame comprising two plates 246 secured together'and spaced apart by posts 247 and said plates are pivoted on the shaft. 197 one on the right hand and the other on the left-hand side of the hub of each of the gears' 245. Mounted between the two plates ot' each pair and journaled in them are two small pinions 248 and 249, the former constantly in mesh with the gear 245 and the latter in mesh -with the said former pinion 248. The construction Ais such that the pinions 248 and 249 are meshes with the pinion 244 as shown in Figs.

237 into engagement with the star .from one of the trame plates the pinion v249 is in an'oblique direction upward a-nd toward the rear. The parts are so arranged and proportioned that the turning motion of said pinion 249 toward the front of the machine is subst ntially compensated for by the Obliquity of the bodily motion of said pinion, with the result that the top-most tooth of the pinion moves straight up into mesh with the pinion 244, or at. least near enough so t'or practical purposes.

It will be perceived that any suitable means c an be employed to elevate the trames 246 one at a time and that thereby the register wheels of either register' will be coupled one at a time with t-he shaft 197 so that the -motion imparted to said shaft by the differential mechanism can be communicated to any selected one of the register wheels and this can be done in either one of the registers or in both at the same time. In the present instance, the frames 246 are controlled by bell-cranks 251 pivoted on the frame rods 181. Each of these bell-cranks has an arm extending forward and upward and formed at its free end with an open. slot which embraces a pin 252 projecting 246. Each of said levers also hasv an upright arm which, Y as here showlnis formed with two stop projections which lies the frame rod 180, said opening being of sufficient width to permit of the desired extent of rocking motion being given to the bell-crank. Said bell cranks are normally drawn to position to drop the frames 246 down, by means of springs 255, each con-l nected to one of the upright arms or tliebell cranks and extending thence toward the front o'f the machine. Any one of the bell cranks 251 can be operated by means of a 11e link 256 extending from said bell crank towardthe rear of the machine and pivoted at its .rear end to an arm 257 projecting'upward from a horizontal transverse rock shaft 258. As shown in Fi 2 and 17, .there 12o is one of these rock shafts for each denomination, nine being shown in the present instance, and they extend across the machine, being pivoted at their ends in stationary plates 260. secured by screws 261 to bosses projecting from the side plates 34. In order to stilfen these shafts 258 and all the other vshafts in the rear part of the machine, frame plates 262 and 263, preferably made on a general-principle somewhat reseinblingtliat and 254, in the opening between 105 'of the plates 65 ai. f.

` therefrom, one for each of the two registers,

and the two arms from any one of these rock shafts are connected with the register wheels of the same denomination in the two registers, so that when any one of the rock shafts 258 is operated the register wheels of Cor responding denomination in both registers' willbe connected with their respective shafts 197.

In order-to operate the shafts 258 any' suitable means may be provided, as far as the parts of my invention already described are concerned. I have however provided novel means for'rocking these shafts under the direct control of the typewriter carriage, preferably through the column stops 27 so that the same column stops which are used to position the carriage also'serve to connect,

up with the differential mechanism, the particular register wheel that corresponds in denomination with the denominational position of the carriage. v

As shown in Figs. 1, 2, 13 and 17, a transverse rock shaft 264 is journaled-at .its ends in the frame plates 260 andsaid rock shaft has projecting therefromtoward the rear of the machine two arms 265, and Said arms support a transverse cross rod 266, the whole constituting a sort of vyoke frame the rod 266of which is moved up and-down by the rocking of the shaft 264. On said rod 266 are pivoted a number of bell cranks 267 ,-one for each denomination, and each of said bell cranks has an upright arm to which is pivoted the rear end of a ylink 268, the forward end`of which is pivoted to an arm 270 projecting upward from one of the rock shafts 258,. lFlach of said rock 'shafts is thus connected with one of the bell-cranks 267 as will be understood from Fig. 2. Each of said bell-cranks has a horizontal arm projecting toward the rear, to which is pivoted the lower end of an upright bar or fee'ler 271. These bars or-feelers 271 extend upward to a position adjacent the typewriter carriage, that is to say, to a position where they can coperate with a part carried by said carriage. Said bars 'pass through the guide plate 165, thebars fanning in as shown in Fig. 13 and beinv thickened at their upperends at4 272. he upper ends of these feelers lie just below the path of the lower edge of each of the rearward projections 167 and 168 of the column stops 27, which projections constitute abutments or selectors which select the feelers and cooperate with said feelers to connectthe register wheels one denomination at a time with the drive shafts. The construction is Such that if one of these column stops stands above the series of feelers and if then the shaft 264 be rocked to move the rod 266 upward, then all of the feelers 271 will move upward idly except the one that is located immediately beneath the column stop. This one will be arrested and the operation will cause its bell crank 267 to be operated; and said bell crank of the obstructed feeler will, through its link 268, rock' one of the shafts 258 and cause theregister wheels of a denomination corresponding to the def nominational position of the carriage, to be connected with the shafts 197. l

In order to operate the shaft 264, said shaft has projecting upward therefrom a crank arm 273 v(Figs. 1, 14 a-nd 17) and said crank arm is connected by a link-274 with a lever 27 5.,(Figs..14 and 15) which lever is pivoted at 276 to a bracket 277 secured by screws v278 to a lug of the left-hand frame piece' 84. The-left-hand end of the shaft 103 is journaled inthe same bracket. At its lower end the lever 275 has pivoted thereto at 280 a Apawl 281, which pawl is normally held up by a spring 282 in position to engage a lug 283 projecting from the side of the upright arm of a bell crank 284. Said bellcrank is pivoted vat 285 to the bracket 277 and it has a horizontal arm that is controlled by a Spring 286, which spring tends to move the upright arm of the bell crank toward the front of the machine. The spring is also connected with the lever 275 in such a way as to move the upper end of said lever tow'ard-therear of the machine into engagement with a stop pin 287. The upright 'ai-m, of vthe `bell crank 284 is bent back upon itself to form a U-shaped part 288 between the branches of which -there is journaled a follower roller 290, which roller is pressed by the spring 286 against the rear edge of a cam or segment 291 which is rigidly mounted on'theuniversal'rock shaft 78. An arm 292 of this segment is adapted to strike up against the stop bar` 98 to limit the return motion of the universal rnck shaft 78. The rear edge of the segment 291 comprises an inclined part 293 with which the roller 290 is normally in engagement and a concentric part 294 on to which the roller passes early in the down stroke of a keyfflhe construction lis such that in the first part of the down stroke of any key the roller 290 is moved toward the rear of the machine and is held in that position during the whole of the down stroke of said key. When .said roller and the lever 284 are moved toward the rear, such rearward motion is communicated by the pawl 281 to the lower end of the lever 275 and the upper end of the said lever 275, acting through the link 274, rocks the shaft 264 to connect one of the register wheels with its drive shaft. The pawl 281 is tripped oil' in the first part of the up-stroke of the key and the denomination select-ing mechanism is allowed to snap back to normal position. This is ef- 

